I did Topscore 1 for ****s and giggles before actual studying and scored 19AA. This was my 'diagnostic' test.
Although, I did have a solid science background from undergrad, and was always good in math.
A majority of applicants receive scores from 17-19, but to go one point higher, it gets much much much harder.
19AA, you would be an average matriculant.
20AA, you will be above average.
21AA, the DAT will not be holding your application back and all doors except Columbia will be open for you.
22AA, Columbia will open their doors for you. Your GPA will scrutinized less.
23AA+, everyone waits in line to bukake you.
So if he did get 19AA with just one day of studying, he could have gotten at least 21AA if he actually put some effort into it. Adcoms don't look at how much you study, but the score you get. He pretty much wasted his talents as he didn't use it to its full potential.